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GetMiniCalRequest Slowness

Hello,

In calendar view, when I'm paginating through weeks, after a time, it becomes very slow.
After analyzing requests with Firebug "Network" tab, I see that it's "GetMiniCalRequest" requests that are very long (about 10 seconds), whereas "SearchRequest" is quite fast.

What can this be due ?
How can I see what's happening during these 10 seconds ?